Daffy Duck in Hollywood

Invincible!

Stage Skip!

At the main menu, enter before selecting an item. At the normal stage select screen, press to move to the next set of levels.

See the Endings

At the main menu, enter before selecting an item:

Easy/Medium difficulty ending

Hard but not all statues collected

Hard with all statues

Fergus Head mode

First enable Invincibility and Stage Skip, then at the main menu, enter before selecting an item. The main sprite becomes the "Fergus Head". (To enter multiple cheats, you can select the difficulty selection or sound test instead of starting a game.)